Java CipherParameters類代碼示例

import org.bouncycastle.crypto.CipherParameters; //導入依賴的package包/類
@Override
    public String decrypt(byte[] encrypted) {
//        Cipher cipher = null;
        String plain;
        try {
//            Security.addProvider(new BouncyCastlePQCProvider());
//            cipher = Cipher.getInstance("AES/CBC/PKCS5Padding", new BouncyCastlePQCProvider());
//            cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(encryptionKey, "AES"), new IvParameterSpec(iv));
//            plain = new String(cipher.doFinal(encrypted), "UTF-8");
            KeyParameter keyParam = new KeyParameter(encryptionKey);
            CipherParameters params = new ParametersWithIV(keyParam, iv);
            BlockCipherPadding padding = new PKCS7Padding();
            BufferedBlockCipher cipher = new PaddedBufferedBlockCipher(
                    new CBCBlockCipher(new AESEngine()), padding);
            cipher.reset();
            cipher.init(false, params);
            byte[] buffer = new byte[cipher.getOutputSize(encrypted.length)];
            int len = cipher.processBytes(encrypted, 0, encrypted.length, buffer, 0);
            len += cipher.doFinal(buffer, len);
            byte[] out = Arrays.copyOfRange(buffer, 0, len);
            plain = new String(out, "UTF-8");
        } catch (Exception e) {
            throw new RuntimeException("decrypt error in SimpleAesManaged", e);
        }
        return plain;
    }
 

import org.bouncycastle.crypto.CipherParameters; //導入依賴的package包/類
public void init(
    boolean             forEncryption, //ignored by this CTR mode
    CipherParameters    params)
    throws IllegalArgumentException
{
    if (params instanceof ParametersWithIV)
    {
      ParametersWithIV ivParam = (ParametersWithIV)params;
      byte[]           iv      = ivParam.getIV();
      System.arraycopy(iv, 0, IV, 0, IV.length);

      reset();

      // if null it's an IV changed only.
      if (ivParam.getParameters() != null)
      {
        cipher.init(true, ivParam.getParameters());
      }
    }
    else
    {
        throw new IllegalArgumentException("SIC mode requires ParametersWithIV");
    }
}
 

import org.bouncycastle.crypto.CipherParameters; //導入依賴的package包/類
public void init(
    boolean                 forSigning,
    CipherParameters        param)
{
    if (forSigning)
    {
        if (param instanceof ParametersWithRandom)
        {
            ParametersWithRandom    rParam = (ParametersWithRandom)param;

            this.random = rParam.getRandom();
            this.key = (ECPrivateKeyParameters)rParam.getParameters();
        }
        else
        {
            this.random = new SecureRandom();
            this.key = (ECPrivateKeyParameters)param;
        }
    }
    else
    {
        this.key = (ECPublicKeyParameters)param;
    }
}
 

import org.bouncycastle.crypto.CipherParameters; //導入依賴的package包/類
/**
 * initialise the EC Elgamal engine.
 *
 * @param param the necessary EC key parameters.
 */
public void init(
    CipherParameters    param)
{
    if (param instanceof ParametersWithRandom)
    {
        ParametersWithRandom    p = (ParametersWithRandom)param;

        if (!(p.getParameters() instanceof ECPublicKeyParameters))
        {
            throw new IllegalArgumentException("ECPublicKeyParameters are required for new public key transform.");
        }
        this.key = (ECPublicKeyParameters)p.getParameters();
        this.random = p.getRandom();
    }
    else
    {
        if (!(param instanceof ECPublicKeyParameters))
        {
            throw new IllegalArgumentException("ECPublicKeyParameters are required for new public key transform.");
        }

        this.key = (ECPublicKeyParameters)param;
        this.random = new SecureRandom();
    }
}
 

import org.bouncycastle.crypto.CipherParameters; //導入依賴的package包/類
protected void engineInitVerify(
    PublicKey   publicKey)
    throws InvalidKeyException
{
    CipherParameters    param;

    if (publicKey instanceof ECPublicKey)
    {
        param = ECUtil.generatePublicKeyParameter(publicKey);
    }
    else if (publicKey instanceof GOST3410Key)
    {
        param = GOST3410Util.generatePublicKeyParameter(publicKey);
    }
    else
    {
        try
        {
            byte[]  bytes = publicKey.getEncoded();

            publicKey = BouncyCastleProvider.getPublicKey(SubjectPublicKeyInfo.getInstance(bytes));

            if (publicKey instanceof ECPublicKey)
            {
                param = ECUtil.generatePublicKeyParameter(publicKey);
            }
            else
            {
                throw new InvalidKeyException("can't recognise key type in DSA based signer");
            }
        }
        catch (Exception e)
        {
            throw new InvalidKeyException("can't recognise key type in DSA based signer");
        }
    }

    digest.reset();
    signer.init(false, param);
}
 

import org.bouncycastle.crypto.CipherParameters; //導入依賴的package包/類
public void init(
    boolean             forEncryption,
    CipherParameters    param)
{
    if (param instanceof ParametersWithRandom)
    {
        ParametersWithRandom  rParam = (ParametersWithRandom)param;

        this.random = rParam.getRandom();
    }
    else
    {   
        this.random = new SecureRandom();
    }

    engine.init(forEncryption, param);

    this.forEncryption = forEncryption;
}
 

import org.bouncycastle.crypto.CipherParameters; //導入依賴的package包/類
public void init(CipherParameters params)
    throws IllegalArgumentException
{
    if (!(params instanceof KeyParameter))
    {
        throw new IllegalArgumentException("'params' must be an instance of KeyParameter");
    }
    KeyParameter keyParameter = (KeyParameter)params;
    byte[] key = keyParameter.getKey();
    if (key.length != 16)
    {
        throw new IllegalArgumentException("'params' must be a 128-bit key");
    }

    this.k0 = Pack.littleEndianToLong(key, 0);
    this.k1 = Pack.littleEndianToLong(key, 8);

    reset();
}
 

import org.bouncycastle.crypto.CipherParameters; //導入依賴的package包/類
/**
 * generate a PBE based key suitable for a MAC algorithm, the
 * key size is chosen according the MAC size, or the hashing algorithm,
 * whichever is greater.
 */
public static CipherParameters makePBEMacParameters(
    PBEKeySpec keySpec,
    int type,
    int hash,
    int keySize)
{
    PBEParametersGenerator  generator = makePBEGenerator(type, hash);
    byte[]                  key;
    CipherParameters        param;
    
    key = convertPassword(type, keySpec);
    
    generator.init(key, keySpec.getSalt(), keySpec.getIterationCount());
    
    param = generator.generateDerivedMacParameters(keySize);
    
    for (int i = 0; i != key.length; i++)
    {
        key[i] = 0;
    }
    
    return param;
}
 

import org.bouncycastle.crypto.CipherParameters; //導入依賴的package包/類
public void init(boolean forEncryption, CipherParameters parameters)
{
    this.forEncryption = forEncryption;
    if (forEncryption)
    {
        if (parameters instanceof ParametersWithRandom)
        {
            ParametersWithRandom p = (ParametersWithRandom)parameters;

            this.random = p.getRandom();
            this.pubKey = (NTRUEncryptionPublicKeyParameters)p.getParameters();
        }
        else
        {
            this.random = new SecureRandom();
            this.pubKey = (NTRUEncryptionPublicKeyParameters)parameters;
        }

        this.params = pubKey.getParameters();
    }
    else
    {
        this.privKey = (NTRUEncryptionPrivateKeyParameters)parameters;
        this.params = privKey.getParameters();
    }
}
 

import org.bouncycastle.crypto.CipherParameters; //導入依賴的package包/類
/**
 * Generate a key parameter derived from the password, salt, and iteration
 * count we are currently initialised with.
 *
 * @param keySize the size of the key we want (in bits)
 * @return a KeyParameter object.
 * @exception IllegalArgumentException if the key length larger than the base hash size.
 */
public CipherParameters generateDerivedParameters(
    int keySize)
{
    keySize = keySize / 8;

    if (keySize > digest.getDigestSize())
    {
        throw new IllegalArgumentException(
               "Can't generate a derived key " + keySize + " bytes long.");
    }

    byte[]  dKey = generateDerivedKey();

    return new KeyParameter(dKey, 0, keySize);
}
 

import org.bouncycastle.crypto.CipherParameters; //導入依賴的package包/類
protected void engineInitSign(
    PrivateKey privateKey)
    throws InvalidKeyException
{
    CipherParameters param = ECUtil.generatePrivateKeyParameter(privateKey);

    digest.reset();

    if (appRandom != null)
    {
        signer.init(true, new ParametersWithRandom(param, appRandom));
    }
    else
    {
        signer.init(true, param);
    }
}
 

import org.bouncycastle.crypto.CipherParameters; //導入依賴的package包/類
static CipherParameters createCipherParameters(ASN1ObjectIdentifier algorithm, ExtendedDigest digest, int blockSize, PKCS12PBEParams pbeParams, char[] password)
{
    PKCS12ParametersGenerator pGen = new PKCS12ParametersGenerator(digest);

    pGen.init(PKCS12ParametersGenerator.PKCS12PasswordToBytes(password), pbeParams.getIV(), pbeParams.getIterations().intValue());

    CipherParameters params;

    if (PKCS12PBEUtils.hasNoIv(algorithm))
    {
        params = pGen.generateDerivedParameters(PKCS12PBEUtils.getKeySize(algorithm));
    }
    else
    {
        params = pGen.generateDerivedParameters(PKCS12PBEUtils.getKeySize(algorithm), blockSize * 8);

        if (PKCS12PBEUtils.isDesAlg(algorithm))
        {
            DESedeParameters.setOddParity(((KeyParameter)((ParametersWithIV)params).getParameters()).getKey());
        }
    }
    return params;
}
 

import org.bouncycastle.crypto.CipherParameters; //導入依賴的package包/類
/**
  * initialise a RC4 cipher.
  *
  * @param forEncryption whether or not we are for encryption.
  * @param params the parameters required to set up the cipher.
  * @exception IllegalArgumentException if the params argument is
  * inappropriate.
  */
 public void init(
     boolean             forEncryption, 
     CipherParameters     params
)
 {
     if (params instanceof KeyParameter)
     {
         /* 
          * RC4 encryption and decryption is completely
          * symmetrical, so the 'forEncryption' is 
          * irrelevant.
          */
         workingKey = ((KeyParameter)params).getKey();
         setKey(workingKey);

         return;
     }

     throw new IllegalArgumentException("invalid parameter passed to RC4 init - " + params.getClass().getName());
 }
 

import org.bouncycastle.crypto.CipherParameters; //導入依賴的package包/類
/**
 * initialise
 *
 * @param forEncryption whether or not we are for encryption.
 * @param params the parameters required to set up the cipher.
 * @exception IllegalArgumentException if the params argument is
 * inappropriate.
 */
public void init(
    boolean             forEncryption,
    CipherParameters    params)
{
    if (!(params instanceof KeyParameter))
    {
        throw new IllegalArgumentException("invalid parameter passed to TEA init - " + params.getClass().getName());
    }

    _forEncryption = forEncryption;
    _initialised = true;

    KeyParameter       p = (KeyParameter)params;

    setKey(p.getKey());
}
 

import org.bouncycastle.crypto.CipherParameters; //導入依賴的package包/類
/**
 * Initialises the GMAC - requires a {@link ParametersWithIV} providing a {@link KeyParameter}
 * and a nonce.
 */
public void init(final CipherParameters params) throws IllegalArgumentException
{
    if (params instanceof ParametersWithIV)
    {
        final ParametersWithIV param = (ParametersWithIV)params;

        final byte[] iv = param.getIV();
        final KeyParameter keyParam = (KeyParameter)param.getParameters();

        // GCM is always operated in encrypt mode to calculate MAC
        cipher.init(true, new AEADParameters(keyParam, macSizeBits, iv));
    }
    else
    {
        throw new IllegalArgumentException("GMAC requires ParametersWithIV");
    }
}